﻿using ArienToolkits.Validator;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web;

namespace ArienToolkits.Network
{
    /// <summary>
    /// 客户端信息提取工具
    /// </summary>
    public class ClientInformation
    {
        #region 获取客户端IP地址
        /// <summary>
        /// 获取客户端IP地址
        /// </summary>
        /// <returns></returns>
        public static string IPAddress
        {
            get
            {
                string result = String.Empty;

                result = System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];

                // 如果使用代理，获取真实IP 
                if (result != null && result.IndexOf(".") == -1)    //没有“.”肯定是非IPv4格式 
                    result = null;
                else if (result != null)
                {
                    if (result.IndexOf(",") != -1)
                    {
                        //有“,”，估计多个代理。取第一个不是内网的IP。 
                        result = result.Replace(" ", "").Replace("'", "");
                        string[] temparyip = result.Split(",;".ToCharArray());
                        for (int i = 0; i < temparyip.Length; i++)
                        {
                            if (RegexValidator.Validate(RegexExpressions.IPAddressPartten, temparyip[i])
                                && temparyip[i].Substring(0, 3) != "10."
                                && temparyip[i].Substring(0, 7) != "192.168"
                                && temparyip[i].Substring(0, 7) != "172.16.")
                            {
                                return temparyip[i];    //找到不是内网的地址 
                            }
                        }
                    }
                    else if (RegexValidator.Validate(RegexExpressions.IPAddressPartten, result)) //代理即是IP格式 
                        return result;
                    else
                        result = null;    //代理中的内容 非IP，取IP 
                }
                if (null == result || result == String.Empty)
                    result = System.Web.HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];

                if (result == null || result == String.Empty)
                    result = System.Web.HttpContext.Current.Request.UserHostAddress;

                return result;
            }
        }
        #endregion
    }
}
